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SUMMARY:Stellar Fireworks: A journey through the spirally dust plumes of W
 olf-Rayet binaries - Yinuo Han
DTSTART:20221026T121500Z
DTEND:20221026T124000Z
UID:TALK189089@talks.cam.ac.uk
CONTACT:Hannah Uebler
DESCRIPTION:Wolf-Rayet stars are the final phase of evolution of the most 
 massive stars before becoming a supernova. Their extremely high luminositi
 es drive fast\, dense winds that are sometimes rich in carbon. Despite the
  harsh circumstellar environment\, Wolf-Rayet stars in binaries can someti
 mes precipitate the right conditions to form large amounts of dust in spec
 tacular shapes. We recently analysed a series of images of the dust produc
 ed by WR140 over 17 years. These images enabled us to model the geometry o
 f the dust shell and track its motion. Surprisingly\, our analysis reveale
 d the dust to be accelerating\, which likely constitutes a first direct wi
 tness of radiation pressure accelerating matter in the circumstellar envir
 onment. I will also discuss our recent observations of the system with JWS
 T\, which produced spectacular images with interesting features well-expla
 ined by our model. These observations reveal interesting physics that help
  us understand the dust formation mechanism in colliding-wind binaries.
LOCATION:The Hoyle Lecture Theatre + Zoom 
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